Electro-Harmonix Big Muff Pi

Key to the Muff’s sound is its huge amount of silicon transistor gain (unleashed by cranking the sustain control), and its tone control, which can take you from woolly mammoth to angry wasp in 180 degrees. David Gilmour is a fan, as is Jack White, but the undisputed ‘King Of Muff’ is Dinosaur Jr’s J Mascis.